280066 has 8 divisors (see below), whose sum is σ = 422604. Its totient is φ = 139200.

The previous prime is 280061. The next prime is 280069. The reversal of 280066 is 660082.

It can be written as a sum of positive squares in 2 ways, for example, as 279841 + 225 = 529^2 + 15^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

280066 is a modest number, since divided by 66 gives 28 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280061) by changing a digit.

280066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166 + ... + 766.

2²⁸⁰⁰⁶⁶ is an apocalyptic number.

280066 is a deficient number, since it is larger than the sum of its proper divisors (142538).

280066 is a wasteful number, since it uses less digits than its factorization.

280066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 280066 is about 529.2126226764. The cubic root of 280066 is about 65.4264660470.

The spelling of 280066 in words is "two hundred eighty thousand, sixty-six".